Pittsburgh Penguins hockey players, from left, Pascal Dupuis, captain Sidney Crosby, Ben Lovejoy and Tyler Kennedy all wear a sweater with a National Hockey League Players' Association logo as they pause between drills during an informal workout at the Iceoplex in Canonsburg, Pa., on Thursday, Oct. 11, 2012. The NHL would've opened the regular season on Thursday if it weren't for the current lockout. (AP Photo/Keith Srakocic)

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Labour negotiations between the NHL and the locked-out players' association may resume Tuesday after a four-day break.

The location and the agenda have yet to be determined. The sides held two days of talks this week in New York without discussion of hockey-related revenue — the core economic issue that has prevented the NHL regular season from starting on time.

"Nothing firm. There is a potential for Tuesday," NHL Deputy Commissioner Bill Daly said in an email to The Associated Press.

The 28-day lockout has already wiped out the entire preseason and the first three days of the regular season. The NHL announced last week that all games have been cancelled through Oct. 24.